WO2001052405A2 - Verfahren und vorrichtung zur linearisierung eines hochfrequenz-hochleistungsverstärkers - Google Patents
Verfahren und vorrichtung zur linearisierung eines hochfrequenz-hochleistungsverstärkers Download PDFInfo
- Publication number
- WO2001052405A2 WO2001052405A2 PCT/DE2001/000050 DE0100050W WO0152405A2 WO 2001052405 A2 WO2001052405 A2 WO 2001052405A2 DE 0100050 W DE0100050 W DE 0100050W WO 0152405 A2 WO0152405 A2 WO 0152405A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- amplifier
- neural network
- data
- output
- modulator
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/34—Negative-feedback-circuit arrangements with or without positive feedback
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/32—Modifications of amplifiers to reduce non-linear distortion
- H03F1/3241—Modifications of amplifiers to reduce non-linear distortion using predistortion circuits
- H03F1/3294—Acting on the real and imaginary components of the input signal
Definitions
- the invention relates to a method and a device for linearizing a high-frequency high-performance amplifier according to the preambles of claims 1 and 5, in particular for mobile radio base stations.
- Generic HF high-performance amplifiers which, for. B. used in mobile radio base stations, have a curved and therefore strongly non-linear characteristic in the area of large output powers near the 1 dB compression point, whereby signals with large amplitudes are distorted or cut off (AM / AM conversion). In addition, the phase of the emitted signal is also rotated (AM / PM conversion).
- AM / AM conversion signals with large amplitudes are distorted or cut off
- AM / PM conversion the phase of the emitted signal is also rotated
- predistortion or predistortion and has so far been used primarily on the analog level and in the small signal range, but also in the digital baseband. This usually happens rigidly, e.g. B. by using diode characteristics.
- adaptive predistortion methods are also known, in which the actual transmit signal at the amplifier output is measured to compensate for the current non-linearity of the amplifier characteristic and is compared with the TARGET Transmission signal at the amplifier input is compared.
- the required predistortion of the input signal can then be determined from the difference on the basis of known mathematical methods (for example by regression, error polynomial, etc.).
- FIG. 1 schematically shows the structure of a device according to the invention for carrying out the method according to the invention
- FIG. 2 shows the structure of the neural network implemented in the device according to the invention
- FIG. 3 shows the inverse amplifier characteristic curve approximated according to the invention by means of a neural network according to FIG. 2;
- FIG. 4 shows the approximation of the gain characteristic curve itself
- FIG. 5 shows an example of the distortion of the baseband vectors X to be carried out using the approximated amplifier characteristic; and Figure 6 shows the linearized amplifier characteristic after predistortion.
- FIG. B The basic structure of a predistortion device according to the invention with a neural network 2 is shown in FIG. B.
- the neural network 2 approximates the current amplifier characteristic curve or its inverse characteristic curve from the I / Q measurement data supplied by the measuring device 4 at the amplifier output and forms correction values while simultaneously evaluating the I / Q data received from the digital baseband modulator 1. These are fed back via the output line 7 to the digital baseband modulator 1, with the data stream of the digital baseband modulator 1, before it is supplied to the HF high-power amplifier 5 via the D / A converter 8 and the HF modulator 9 Predistorting correction values and in this way compensating for the non-linearity of the characteristic of the HF high-power amplifier 5.
- Figure 2 shows schematically the structure of the neural network. It comprises an input layer 11, an intermediate layer 12 and an output layer 13 which are cross-linked with weighted edges.
- the neurons of the input layer 11 are provided with a bias function x m
- the neurons of the intermediate layer implement different exponential, sigmoidal and polynomial functions f
- the neurons of the output layer have a sum function ⁇ .
- the weight factors Cij randomly assigned at the start and the bias inputs x m of the neural network are optimally set iteratively with the back propagation algorithm. In doing so, the set of signal vectors are successively
- the target function E of the network to be minimized is calculated, e.g. B .:
- the constants ki and k 2 are arbitrary weight factors, and "spectrum” is a measure obtained from a Fast Fourier Transform (FFT) of the signal vectors, yi and n are the desired output values of the amplifier, ie generally constant times Xi.
- FFT Fast Fourier Transform
- ⁇ x m - ⁇ * dE / dx m .
- FIG. 3 shows how the neural network 2 has learned the inverse amplifier characteristic from heavily noisy measurement data at the RF amplifier output.
- the amplifier characteristic curve itself can also be approximated.
- Figure 6 shows the effects achieved by predistortion. Both the old signal vectors X a ⁇ t and the new, distorted signal vectors X were newly fed into the trained neural network 2. As expected, the nonlinear amplifier characteristic for the values X a ⁇ t and the linear characteristic for X ne u.
- Such a neural network can be fed and trained again and again with newly measured vectors even during operation. In this way, drifts of the amplifier over time and temperature can also be adapted and compensated.
- the invention has the advantage that the target function to be optimized can be defined flexibly.
- the target function can consist of any number of arbitrarily weighted individual functions.
- the target function can be defined differently for different sections of the characteristic curve of the amplifier.
- the nonlinear characteristic of the amplifier or its inverse characteristic can be determined by the neural network, even if the measurement signal is very noisy.
- the calculation accuracy is arbitrarily good and only depends on the network size and the computing time.
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/181,196 US7274749B2 (en) | 2000-01-13 | 2001-01-09 | Method and apparatus for the linearization of a radio frequency high-power amplifier |
JP2001552515A JP2003520478A (ja) | 2000-01-13 | 2001-01-09 | 高周波高電力増幅器を直線化する方法及び装置 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10001151.9 | 2000-01-13 | ||
DE10001151A DE10001151A1 (de) | 2000-01-13 | 2000-01-13 | Verfahren und Vorrichtung zur Linearisierung eines Hochfrequenz-Hochleistungsverstärkers |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2001052405A2 true WO2001052405A2 (de) | 2001-07-19 |
WO2001052405A3 WO2001052405A3 (de) | 2002-03-28 |
Family
ID=7627392
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DE2001/000050 WO2001052405A2 (de) | 2000-01-13 | 2001-01-09 | Verfahren und vorrichtung zur linearisierung eines hochfrequenz-hochleistungsverstärkers |
Country Status (4)
Country | Link |
---|---|
US (1) | US7274749B2 (de) |
JP (1) | JP2003520478A (de) |
DE (1) | DE10001151A1 (de) |
WO (1) | WO2001052405A2 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9872260B2 (en) | 2013-12-06 | 2018-01-16 | Fujitsu Limited | Power adjustment method, computer-readable recording medium and power adjustment apparatus |
Families Citing this family (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7248642B1 (en) | 2002-02-05 | 2007-07-24 | Andrew Corporation | Frequency-dependent phase pre-distortion for reducing spurious emissions in communication networks |
US7197085B1 (en) | 2002-03-08 | 2007-03-27 | Andrew Corporation | Frequency-dependent magnitude pre-distortion for reducing spurious emissions in communication networks |
US7266159B2 (en) * | 2002-03-08 | 2007-09-04 | Andrew Corporation | Frequency-dependent magnitude pre-distortion on non-baseband input signals for reducing spurious emissions in communication networks |
US7139327B2 (en) * | 2002-06-10 | 2006-11-21 | Andrew Corporation | Digital pre-distortion of input signals for reducing spurious emissions in communication networks |
US7251293B2 (en) * | 2003-06-27 | 2007-07-31 | Andrew Corporation | Digital pre-distortion for the linearization of power amplifiers with asymmetrical characteristics |
GB2407929A (en) * | 2003-11-05 | 2005-05-11 | Motorola Inc | A predistorter for a polar transmitter, using look-up tables and interpolation, and possessing a simple training procedure. |
US9703892B2 (en) | 2005-09-14 | 2017-07-11 | Millennial Media Llc | Predictive text completion for a mobile communication facility |
US8711976B2 (en) | 2011-05-12 | 2014-04-29 | Andrew Llc | Pre-distortion architecture for compensating non-linear effects |
US8633769B2 (en) | 2012-03-15 | 2014-01-21 | Telefonaktiebolaget L M Ericsson (Publ) | Dual loop adaptation digital predistortion architecture for power amplifiers |
EP3581953A1 (de) | 2018-06-11 | 2019-12-18 | Koninklijke Philips N.V. | Verfahren zur konfiguration einer rf-übertragungsanordnung |
CN110533169A (zh) * | 2019-08-30 | 2019-12-03 | 海南电网有限责任公司 | 一种基于复值神经网络模型的数字预失真方法及系统 |
WO2021106033A1 (ja) * | 2019-11-25 | 2021-06-03 | 三菱電機株式会社 | 歪み補償装置及び歪み補償方法 |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2517410B2 (ja) * | 1989-05-15 | 1996-07-24 | 三菱電機株式会社 | 学習機能付集積回路装置 |
US5086479A (en) * | 1989-06-30 | 1992-02-04 | Hitachi, Ltd. | Information processing system using neural network learning function |
US5077619A (en) * | 1989-10-25 | 1991-12-31 | Tacan Corporation | High linearity optical transmitter |
JPH07210207A (ja) * | 1994-01-17 | 1995-08-11 | Hitachi Ltd | 適応制御装置 |
US6108385A (en) * | 1996-07-08 | 2000-08-22 | Silicon Wireless Limited | Method and apparatus for reducing intermodulation distortion in digital wideband transmission systems |
GB9811381D0 (en) * | 1998-05-27 | 1998-07-22 | Nokia Mobile Phones Ltd | Predistortion control for power reduction |
US6281936B1 (en) * | 1999-05-14 | 2001-08-28 | Harris Corporation | Broadcast transmission system with sampling and correction arrangement for correcting distortion caused by amplifying and signal conditioning components |
US6236837B1 (en) * | 1998-07-30 | 2001-05-22 | Motorola, Inc. | Polynomial Predistortion linearizing device, method, phone and base station |
US6625227B1 (en) * | 1999-09-30 | 2003-09-23 | Ericsson Inc. | Artificial ramping of transmit power for burst transmissions |
-
2000
- 2000-01-13 DE DE10001151A patent/DE10001151A1/de not_active Ceased
-
2001
- 2001-01-09 JP JP2001552515A patent/JP2003520478A/ja active Pending
- 2001-01-09 US US10/181,196 patent/US7274749B2/en not_active Expired - Fee Related
- 2001-01-09 WO PCT/DE2001/000050 patent/WO2001052405A2/de active Application Filing
Non-Patent Citations (2)
Title |
---|
BENVENUTO ET AL: "A neural network approach to data predistortion with memory in digital radio systems" PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON COMMUNICATIONS (ICC). GENEVA, MAY 23 - 26, 1993, NEW YORK, IEEE, US, Bd. 3, 23. Mai 1993 (1993-05-23), Seiten 232-236, XP010136900 ISBN: 0-7803-0950-2 * |
BENVENUTO N ET AL: "GENERALISED BACKPROPAGATION ALGORITHM FOR TRAINING A DATA PREDISTORTER WITH MEMORY IN RADIO SYSTEMS" METAL FINISHING, ELSEVIER SCIENCE PUBLISHING, NEW YORK, NY, US, Bd. 94, Nr. 9, 26. September 1996 (1996-09-26), Seiten 1925-1926, XP000637913 ISSN: 0026-0576 * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9872260B2 (en) | 2013-12-06 | 2018-01-16 | Fujitsu Limited | Power adjustment method, computer-readable recording medium and power adjustment apparatus |
Also Published As
Publication number | Publication date |
---|---|
JP2003520478A (ja) | 2003-07-02 |
US7274749B2 (en) | 2007-09-25 |
DE10001151A1 (de) | 2001-07-26 |
US20030076896A1 (en) | 2003-04-24 |
WO2001052405A3 (de) | 2002-03-28 |
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